- Implemented by
- Hastur, Cyclops
Back end
- Record and playback on DVB-T
- DVB-T (Freeview)
- Simultaneous record and playback
- Media sharing
Hardware
Back-end
Operating Systems
Data Partitioning
- Separate metadata and library trees allows some clients to collect metadata
Single Volume
- Each MEDIATYPE has separate library and metadata trees
- Data trees are grouped for export using "bind" mounts
- Matches nfs export concept
Logical Volumes Option
- Each MEDIATYPE has a logical volume, lv-MEDIATYPE
- Each lv-MEDIATYPE has separate library and metadata trees
- Trees are grouped for export using normal mounts
- Requires a resizeable filesystem (i.e. not XFS)
File Permissions
Users
| media-centre | Default owner | rw all media |
Groups
| Group | Role | Permissions |
|---|
| mc-music | Plays music | ro music lib |
| mc-videos | Plays videos | ro video lib |
| mc-movies | Plays movies | ro movies lib |
| mc-photos | Shows photos | ro photos lib |
| mc-tv | Plays recordings | ro recordings |
| mc-games | Plays games | ro game roms lib |
| mcadm-music | Manages music | rw music library |
| mcadm-videos | Manages videos | rw video library |
| mcadm-movies | Manages movies | rw movie library |
| mcadm-photos | Manages photos | rw photo library |
| mcadm-tv | Manages recordings | rw recordings |
| mcadm-games | Manages games | rw game roms lib |
- All media files have owner permissions "rwx"
- All media files have group (ACL mask) permissions "rwx"
- All media files have other permissions "---"
- All MEDIATYPE files have named group "mcadm-MEDIATYPE" permissions "rw-"
- All MEDIATYPE files have named group "mc-MEDIATYPE" permissions "r--"
- All MEDIATYPE directories have default ACLs? reflecting the above permissions
Example Configuration
/etc/passwd
media-centre:x:3000:3000:Media Centre:/nonexistent:/usr/sbin/nologin
Example /etc/group
mc-movies:x:3003:mythtv,mediatomb,admin1,user1
mc-music:x:3001:mythtv,mediatomb,mpd,admin1,user1
mc-photos:x:3007:mythtv,admin1,user1
mc-tv:x:3009:mythtv,mediatomb,admin1,user1
mc-videos:x:3002:mediatomb,admin1,user1
mcadm-movies:x:3006:,admin1
mcadm-music:x:3004:mpd,admin1
mcadm-photos:x:3008:,admin1
mcadm-tv:x:3010:,admin1
mcadm-videos:x:3005:,admin1
mc-users:x:3011:admin1,user1
Example ACL (getfacl /mnt/media/movies)
# file: library
# owner: media-centre
# group: mcadm-movies
user::rwx
group::---
group:mc-movies:r-x
group:mcadm-movies:rwx
mask::rwx
other::---
default:user::rwx
default:group::r-x
default:group:mc-movies:r-x
default:group:mcadm-movies:rwx
default:mask::rwx
default:other::---
User Contributed Files
- All users have a
$user/shared-media directory with write permission
$user/shared-media ACLs? allow access by mediasys groups
mediasys/users/$user is a symlink to $user/shared-media
- CIFS requires
wide links = yes for the mediasys share.
- Not compatible with NFS.
Data Export
- A single shared tree for mediasys
- Each MEDIATYPE library and metadata directory is mapped into the single tree.
- Shares per MEDIATYPE writeable by the admin group for that MEDIATYPE.
Example fstab
/etc/fstab
# Media mounts
/dev/vg-media/home /home ext4 defaults,noatime,nosuid,noauto,acl 0 0
/dev/vg-media/media /mnt/media ext4 defaults,noatime,nosuid,noauto,acl 0 0
# Export mounts
/mnt/media/movies/library /export/mediasys/movies/library none bind,noauto 0 0
/mnt/media/movies/metadata /export/mediasys/movies/meta none bind,noauto 0 0
/mnt/media/music/library /export/mediasys/music/library none bind,noauto 0 0
/mnt/media/music/metadata /export/mediasys/music/meta none bind,noauto 0 0
/mnt/media/tvshows/library /export/mediasys/tvshows/library none bind,noauto 0 0
/mnt/media/tvshows/metadata /export/mediasys/tvshows/meta none bind,noauto 0 0
/mnt/media/recordings /export/mediasys/recordings none bind,noauto 0 0
/mnt/media/photos/library /export/mediasys/photos/library none bind,noauto 0 0
/mnt/media/photos/metadata /export/mediasys/photos/meta none bind,noauto 0 0
Samba/CIFS
- Requires username/password
Example Configuration
/etc/smb.conf
[mediasys]
path=/export/mediasys
browseable = yes
writable = yes
mangled names = no
follow symlinks = yes # for per-user shared-media
wide links = yes # for per-user shared-media
valid users = mythtv,@mc-users
[homes]
path=/home/%S
comment = Home Directories
browseable = no
writable = yes
create mask = 0700
directory mask = 0700
valid users = %S
mangled names = no
# Administrative shares - not browseable by default
[movies]
path=/mnt/media/movies
browseable = no
writable = yes
mangled names = no
valid users = @mcadm-movies
...
NFS
Read-only Exports (without security)
/etc/exports
/export/mediasys 192.168.0.0/24(ro,fsid=0,sync,no_subtree_check)
/export/mediasys/movies/library 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/movies/meta 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/tvshows/library 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/tvshows/meta 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/music/library 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/music/meta 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/photos/library 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
/export/mediasys/photos/meta 192.168.0.0/24(ro,nohide,sync,no_subtree_check)
Permissions fixes for NFSv3?
/export/mediasys 192.168.0.0/24(ro,fsid=0,sync,no_subtree_check,all_squash,anongid=3000)
/export/mediasys/movies/library 192.168.0.0/24(ro,nohide,sync,no_subtree_check,anongid=3003)
...
mount -t nfs4 -o ro media: /mnt/media
Capture Cards
Linux Chipset Support
ivtv Driver supported hardware
DVB-T
DVD Encoding
Profiles
High Quality Compressed
- H.264 video
- AC3? audio
- mp4 container
- ~2GB
High Quality Raw
Notes
- Hardware or software encoding?
- Hard enc more expensive, Soft enc needs more powerful CPU
- Does a software encoder require encoding to MPEG2??
- Can a software encoder encode to something else in Realtime?
- DivX?, Xvid, H.264 check processor requirements
- MPEG-4 encoders
- Hauppauge HVR-4000 does H.264
- Front end may need up to 1GB RAM to store MythTV? UI elements for 1080p displays
- VIA UniChromePro? graphics may eventually be capable of H.264 acceleration with XvMC?
- VIA & nVidia cards can accelerate decoding of MPEG2?